Analysis of ΔT driven contact melting of phase change material around a horizontal cylinder

2008 ◽  
Vol 49 (5) ◽  
pp. 1002-1007 ◽  
Author(s):  
Wenzhen Chen ◽  
Yuansong Zhao ◽  
Fengrui Sun ◽  
Zhiyun Chen ◽  
Miao Gong
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Horizontal Cylinder ◽  
Contact Melting ◽  
Change Material

The Fundamentals of Sliding Contact Melting and Friction

1989 ◽  
Vol 111 (1) ◽  
pp. 13-20 ◽  
Author(s):  
A. Bejan
Keyword(s):  
Phase Change ◽  
Friction Factor ◽  
Phase Change Material ◽  
Relative Motion ◽  
Temperature Difference ◽  
Normal Force ◽  
Frictional Heating ◽  
Contact Melting ◽  
Sliding Contact ◽  
Change Material

This paper focuses on the phenomenon of melting and lubrication by the sliding contact between a phase-change material and a smooth flat slider. The first part of the study considers the limit in which the melting is due primarily to “direct heating,” that is, to the temperature difference between the solid slider and the melting point of the phase-change material. It is shown that in this limit the relative motion gap has a uniform thickness and that the friction factor decreases as both the normal force and the temperature difference increase. The second part considers the limit where the melting is caused mainly by the frictional heating of the liquid formed in the relative motion gap. This gap turns out to have a converging-diverging shape that varies with the parameters of the problem. As the normal force increases, a larger fraction of the melt is pushed out through the upstream opening of the relative motion gap. Means for calculating the melting speed, the friction factor, and the temperature rise along the slider surface are developed.

The Melting of an Ice Shell on a Heated Horizontal Cylinder

1994 ◽  
Vol 116 (3) ◽  
pp. 702-708 ◽  
Author(s):  
J. V. C. Vargas ◽  
A. Bejan ◽  
A. Dobrovicescu
Keyword(s):  
Phase Change ◽  
Shell Thickness ◽  
Melting Process ◽  
Horizontal Cylinder ◽  
Contact Melting ◽  
Laboratory Measurements ◽  
The Third ◽  
History Of ◽  
Ice Shell ◽  
Change Material

This paper describes the fundamentals of melting when a shell of phase-change material rides on a heated horizontal cylinder. In the first part of the paper, contact melting theory is used to predict the history of the melting process and, in particular, the time when the remaining ice falls off the cylinder. It is shown that the melting process consists of two distinct regimes, first, an early regime when the cylinder is surrounded by ice and, second, a late regime when the cylinder cuts through the top of the ice shell. The second part describes laboratory measurements that validate the theory. The third part of the paper shows that in the complete cycle that starts with freezing the shell and ends with the contact-melting removal of the shell, there exists an optimal frozen shell thickness such that the cycle-averaged production of ice is maximized.

New analysis of contact melting of phase change material around a hot sphere

2007 ◽  
Vol 44 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Wenzhen Chen ◽  
Bo Zhu ◽  
Zhiyun Chen ◽  
Haofeng Li ◽  
Fengrui Sun
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Contact Melting ◽  
Change Material
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